42 lines
1.1 KiB
JavaScript
42 lines
1.1 KiB
JavaScript
export default function(node, {evaluate, scope}) {
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const elements = [];
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const asyncSpread = Object.create(null);
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let isAsync = false;
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for (const index in node.elements) {
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const element = node.elements[index];
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if ('SpreadElement' === element.type) {
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const {async, value} = evaluate(element.argument, {scope});
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isAsync = isAsync || async;
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if (async) {
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elements.push(value);
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asyncSpread[elements.length - 1] = true;
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}
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else {
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elements.push(...value);
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}
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}
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else {
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const {async, value} = evaluate(element, {scope});
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isAsync = isAsync || async;
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elements.push(value);
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}
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}
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return {
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async: !!isAsync,
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value: !isAsync
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? elements
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: Promise.all(elements).then((elementsAndOrSpreads) => {
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const elements = [];
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for (let i = 0; i < elementsAndOrSpreads.length; ++i) {
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if (asyncSpread[i]) {
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elements.push(...elementsAndOrSpreads[i]);
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}
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else {
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elements.push(elementsAndOrSpreads[i]);
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}
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}
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return elements;
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}),
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};
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}
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